
Samsung Galaxy Light
The latest firmware for Samsung Galaxy Light (SGH-T399) is T399UVUAQE1 with Android 4.2.2 (Jelly), released on May 10, 2017 for 1 region (CSC). Every official firmware build for SGH-T399, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/T399UVUAQE1
All 4 builds in our database run Android 4.2.2 (Jelly). The newest build, T399UVUAQE1, was released on May 10, 2017. No new build has appeared for 115 months, so regular updates for this model have most likely ended.
Box codes of SGH-T399 for different colors and markets. Firmware is chosen by the model code SGH-T399 and your region (CSC), not by the SKU.

SGH-I927

SGH-S730M

SGH-T999N

SGH-T989D

SGH-T859

SGH-T599V

SGH-I757M

SGH-I747
The newest firmware for SGH-T399 runs Android 4.2.2 (Jelly): build T399UVUAQE1, released on May 10, 2017.
The latest build for SGH-T399, T399UVUAQE1, was released on May 10, 2017 (9 years ago).
SGH-T399 has had no new firmware for 115 months, so regular updates have most likely ended.
Yes, all firmware files for SGH-T399 are 100% official, original, and obtained directly from Samsung servers.
To flash SGH-T399, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SGH-T399.